Well, this shows how little I know about music! I saw Uriah Heep perform this live at The Lyceum, when they opened on a bill which included Black Sabbath and Yes. It was the night before Pink Floyd headlined a free concert in Hyde Park. This one song stuck in my mind and I thought it had been penned by the band.
I have never heard it performed by anybody else, although I did hear the album track by UH on the radio a few months ago. I was very disappointed because it was nothing like as melodic as I had remembered it!